>> reporter: romney said at a recent stop it is not about winning. >> mitt romney is the underdog and he will be ready on the issues which is what this is about. >> they say the debate will pressure the challenger. >> i think the debate will be interesting and they will be held to account for as far -- for more as far as the facts and details. >> reporter: both know the questions an answers can be costly. >> quite a few have lost an election with a debate. >> meaning what happens tonight could decide what happened. >> live in denver, i am sandra back to you. >> our coverage starts at 6:00 p.m. time now 4:46, they created a protest to ban sitting on sidewalks in the city's commercial areas. opponents shared ice cream and a kiss in front of city hall and they say it was a recreation of president barack obama and michelle obama's first date of eating ice cream on the sidewalk. it will unfairly tar get the homeless. a san francisco city leader is working to get people covered up and they are receiving numerous complaints about the naked people who frequented the public plaza at 17th and m